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Max drawdown and risk of ruin explained: why a 50% loss needs a 100% gain

What maximum drawdown is, why recovery gets harder as losses grow, and how your risk per trade changes the chance of surviving a bad streak. With a simple recovery table.

2026-11-04 · 3 min read · ICC Zillas

Two numbers decide whether a trader is still trading next year: how deep the account can fall, and how likely it is that a bad streak ends the account for good. Both are about survival, not about being right. This guide explains them in plain words.

What maximum drawdown means

Drawdown is the fall from a high point of your balance to a later low point. Maximum drawdown is the biggest such fall in the period you look at. If your balance went from 10,000 to 12,000, then down to 9,600, your max drawdown is 2,400, or 20% of the peak.

It is a better picture of pain than the average loss, because it shows what a real bad period felt like. In ICC Zillas the statistics show max drawdown and the recovery factor (net profit divided by max drawdown). The guide lists where each number lives. Set a starting balance on the account so drawdown can also be shown in percent.

Why recovery is not symmetrical

A loss is measured against the balance you had. A gain is measured against the smaller balance you have now. That is why getting back needs more than the percent you lost:

Loss from peakGain needed to get back
10%11.1%
20%25%
30%42.9%
50%100%
70%233%

The formula is simple: gain needed = loss / (1 - loss). Small drawdowns are easy to fix. Deep ones can take years, and during that time many traders start taking extra risk to hurry, which makes things worse.

What risk of ruin means

Risk of ruin is the chance that you lose so much that you cannot continue, or that you break a limit such as a prop firm's max drawdown. You cannot know the exact number for real markets, but you can understand what drives it:

How risk per trade changes a losing streak

Losing streaks are normal, even for good systems. Look at what a streak of 10 losses in a row does to the account at different risk sizes:

Risk per tradeAccount after 10 losses in a row
1%about -9.6%
2%about -18.3%
5%about -40.1%
10%about -65.1%

At 1% the streak is annoying. At 10% it is close to the end, and you need about 187% to recover. The strategy did not change, only the size. You can try your own numbers in the risk of ruin calculator.

How to use your journal

  1. Find your longest losing streak. The journal shows it. Multiply your usual risk by that streak length to see how deep it went.
  2. Check your real risk. Compare planned risk with the actual loss in R. Trades that lost 2R or 3R with a "1R" plan are your real risk problem.
  3. Review the worst drawdown. What did you do during it: more trades, bigger size, new setups? Tag those trades as mistakes.
  4. Set a limit before you need it. For example, cut size in half when the account is 5% below its high. A written rule beats a decision made under stress (see a stop-trading rule).

Prop firm accounts

On a challenge, max drawdown is a hard rule, and the type matters. Read trailing vs static drawdown and use the drawdown calculator to see your remaining room before each trade.

A simple takeaway

Pick a risk per trade small enough that your worst realistic losing streak is something you can live with. Then track your max drawdown every week. Open the app and look at the number on your own account.

Trading carries a high risk of losing money. This article is education, not financial advice, and no rule or tool guarantees that you pass a challenge or make a profit.

Put it into practice

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